CN114206363B

CN114206363B - Silybum marianum lean fruit extract for promoting hair growth

Info

Publication number: CN114206363B
Application number: CN202080054775.0A
Authority: CN
Inventors: J-H·索拉; D·巴克韦尔; H·迪普朗
Original assignee: Pierre Fabre Dermo Cosmetique SA
Current assignee: Pierre Fabre Dermo Cosmetique SA
Priority date: 2019-08-06
Filing date: 2020-08-06
Publication date: 2023-03-21
Anticipated expiration: 2040-08-06
Also published as: MX2022001639A; BR112022001032A2; US20220331387A1; WO2021023820A1; CN114206363A; FR3099699A1; EP4009997A1

Abstract

The present invention relates to the use of an extract of the lean fruit (akenes) of Silybum marianum (L.) Gaertn and of a composition containing said extract in the cosmetic and dermatological field of promoting hair growth.

Description

Silybum marianum lean fruit extract for promoting hair growth

Technical Field

The present invention relates to an extract of Silybum marianum (l.) Gaertn's lean fruit (akenes) and the use of a composition containing the extract for promoting hair growth in the cosmetic and dermatological field.

Background

Hair care, not only for cosmetic purposes but also to prevent hair loss and to regenerate hair, has been stimulating research. Many theories have been attempted to elucidate the etiology of hair loss in the case of baldness, hair loss, baldness patches, etc., which are attributed to increased intracranial tissue tension, decreased blood supply, or certain endocrine or neurological disorders.

The hair follicle is a micro-organ fixed in the skin up to the subcutaneous tissue, whose main role is to produce the hair shaft. The distribution of hair follicles is established during intrauterine growth and the number is genetically determined. Hair follicles are dynamic structures that produce hair during the tissue growth and remodeling cycle. This cycle can be divided into three phases:

growth phase (anage), papilla (papille dermique) cells (fibroblasts) transmit signals to the stem cells of the hair bulb (bulbbe) and proliferate them. The cells will transform and coat the papilla to form the sulfur matrix of the hair. They divide and differentiate into follicular keratinocytes responsible for hair structure. In order for hair to be well-structured, these keratinocytes require sulfur proteins, vitamin B6 and various minerals, such as zinc and magnesium. The duration of this phase determines the length of the hair and depends on the proliferation and differentiation of cells of the matrix at the bottom of the follicle.

The catagen period (catagene)), the matrix dies and thus the papilla no longer comes into contact with it. There is no longer communication between cells. The hair follicle and hair papilla move up to the epidermis.

Resting (telogen), the cells of the papilla and the hair bulb are intact but inactive. The hair is shed. The cycle must be restarted in order to grow new hair.

Thus, the hair is constantly renewed, and most of 100,000 to 150,000 hairs of the head hair are in the growth phase. For healthy hair, normal and physiological hair loss ranges from 60 to 100 per day. Beyond this number, whether shedding is sporadic or established, alopecia is considered pathological.

The term alopecia (alopecie) refers to the partial or general lack of hair on the head. Alopecia (effluvium) refers to excessive hair loss.

Many factors may be associated with alopecia, such as, for example, genetic factors, age, sex, disease, stress, hormonal problems, side effects of drugs, scars. Several forms of alopecia can be distinguished:

hereditary androgenetic alopecia, most common; premature hair loss occurs in subjects with genetic factors and affects men in particular. It appears as a reduction in hair mass, even baldness, affecting 50% of men over the age of 50.

Postmenopausal alopecia is the most common cause of baldness in women. Female hair loss is more diffuse and widespread than male. Diffuse female alopecia is a disease that often begins in menopause, affecting approximately 40% of women over the age of 70. The term diffuse indicates that alopecia affects the entire scalp uniformly, unlike men.

Acute or reactive alopecia, which may be associated with drug therapy (including cancer therapy), stress, childbirth, severe dietary deficiency, iron deficiency, hormonal disorders, a concurrent and diffuse mass loss.

Cicatricial alopecia, possibly caused by skin problems (tumors, burns, baldness spots), acute radiation, lupus erythematosus or parasites (ringworm, lichen).

Alopecia areata, apparently caused by autoimmunity, characterised by the presence of more or less large plaques in one or more places.

Congenital alopecia, which is rare, corresponds to the absence of hairy root or head abnormalities (mutations).

The term alopecia also encompasses all types of hair follicle damage, the ultimate result of which is permanent, partial or general hair loss.

We can distinguish between diffuse hair loss and topical hair loss.

Diffuse alopecia: alopecia vulgaris, alopecia in telogen, alopecia in growth period, and alopecia areata. Among the diffuse alopecia, the most common are alopecia universalis (androgenetic alopecia in men and women) and telogen effluvium (after high fever, pregnancy, medication or severe dietary deficiency).

Local alopecia: androgenetic alopecia, alopecia areata, cicatricial alopecia and tumors. Topical alopecia is observed in the case of male androgenetic alopecia (temples, alopecia totalis), baldness patches, pulling induced alopecia (trichotillomania, braiding and straightening) or cicatricial alopecia (central intensive (centrofuge) cicatricial alopecia, post-menopausal forehead fibrotic alopecia). We may also cite inflammatory cicatricial alopecia, in particular folliculitis, among which exfoliative folliculitis (folliculitis distemper) and alopecia folliculitis (folliculitis d velant). Tumors and skin growth are also accompanied by local hair loss (sebaceous gland hamartomas, basal cell carcinomas, squamous cell carcinomas).

Alopecia is essentially related to the interruption of hair renewal, which initially results in an increased frequency of cycles at the expense of the quality of the hair, followed by the quantity of hair. The most common phenomenon is a decrease in the duration of the growth phase (growth phase) associated with the cessation of cell proliferation. The result is a premature induction of the catagen phase, resulting in a large number of hair follicles in the resting phase and thus more hair loss. Thus, in order to combat alopecia, it is necessary to restart the hair cycle, for example by activating the anagen phase.

To date, a variety of products have been proposed to combat hair loss, particularly for inducing or stimulating hair growth. Most products combine several active ingredients that can have a beneficial effect on the biological parameters involved in hair loss. Among the most common active ingredients we can cite, by way of example: vitamins such as vitamin a, E, B5, B6, C, H and PP; trace elements such as zinc, copper, magnesium, silicon; protein derivatives, such as peptides, sulfur-containing amino acids (methionine, cystine, cysteine or derivative types); essential oils or extracts of plant origin, lipophilic or hydrophilic, this list not being exhaustive; antifungal agents, such as piroctone olamine, undecene derivatives, cyproconazole; chemical molecules are synthesized which are known to act specifically on androgen receptor or 5-alpha reductase activity. Minoxidil or 2, 4-diamino-6-piperidinylpyrimidine 3-oxide are now the standard for the treatment of androgenic alopecia. Although many theories are proposed for their mechanism of action, they remain unclear. Furthermore, its efficacy is still limited because although alopecia is stabilized in many clinical cases, we see that once treatment is stopped, the alopecia process restarts. It is limited to daily use and may lead to unwanted side effects such as local skin reactions or systemic effects observed in patients with prolonged use. Furthermore, compositions comprising a very large number of active agents, possibly derivatives of 2,4-diaminopyrimidine 3-oxide, such as those described in patent application EP0522964, have been proposed in the context of hair regrowth. Clinical studies have shown that PGF2 α analogues have properties that induce growth in human and animal hair and eyelashes (Johnstone, am J Opht,124 (4), 544-547, 1997). In humans, tests on the scalp have shown that prostaglandin E2 analogues (viprostol) have the property of increasing hair density. Application WO98/33497 describes pharmaceutical compositions containing prostaglandins or prostaglandin derivatives for promoting hair growth.

Thus, despite the many options available today, there is still a need for new products to promote hair regrowth that are both natural and environmentally friendly, while being as effective as the active compounds.

Recent advances in studying hair cycle biology have involved early and late stem cells (Mesler et al, cell Reports 19, 809-821, 2017). In addition, these early stem cells, like the progeny cells, produce certain keratins with essential functional properties for preventing hair loss. Among these keratins, K75 is produced first, and its genetic defect in humans can lead to pathological hair loss. This protein is characteristic of the cells forming the companion layer of the inner sheath of the root of the hair follicle (Gu and Coulombe J Invest Dermatol,2007, 127 (5): 1061-73). In a study described by Sperling et al (J Cutan Pathol 2010, 37-243-248), it was shown that K75 expression was greatly reduced during early exfoliation of the inner sheath of the root of the hair follicle. Since this exfoliation is a histological marker of alopecia, it was found that this K75 protein clearly plays a key role in the mechanism of alopecia.

The scientific name Silybum marianum (l.) gartn.) refers to an annual or biennial plant of the family asteraceae, with a strong stem, which may be more than one meter in height. Its large and glossy leaf has no leaf support, is white mottled, and has hard sharp prickle on its edge. Flowers are concentrated in terminal capitalized inflorescences, usually solitary. The flowers are surrounded by large, barbed bracts with very sharp ends. The flowers were tubular, five-split, purplish-deep red. The fruit is glossy and thin, black or yellow speckled, with a crown on the top and fine, annular, serrated bristles on the bottom. The common name for this plant is milk thistle (Chardon Marie).

The lean fruit of silybum marianum (often mistakenly called seed in the literature) and its formulation are traditionally used orally for the symptomatic treatment of hepatic functional digestive disorders.

The main active ingredient in the lean fruit of silybum marianum is silymarin (silymarin), which is a mixture of several flavonolignans (mainly silybin, isosilybin, silychristin, and silydianine). Leptin contains up to 3% by weight of silymarin. The leptin fruit also consists of oil (20-30% by weight), plant mucilage and protein.

Silymarin has been the subject of numerous studies (in vitro, in vivo and clinical) and has been shown to have antioxidant, hepatoprotective, digestive and even anti-inflammatory properties.

At present, the leptin extract of silybum marianum titrated with silymarin is present in several pharmaceutical preparations for the treatment of various liver and biliary diseases, such as

Silibinin (the major silymarin flavonoid) was also the subject of recent hair growth studies (Cheon et al, J Microbiol Biotech 29 (2), 321-329, 2019), which signals through Akt Wnt/β -catenin.

The oil from silybum marianum, which is rich in omega 6 and vitamin E, is mainly used for cooking. It is usually obtained from lean fruit by cold pressing. However, in vivo studies of the antioxidant and liver protective properties of this milk thistle oil have been performed in rats or mice by oral administration (Zhu et al, pharmacogn Mag,10 (suppl 1) S92-S99, 2014). Application WO2018/002338 describes silybum marianum lean fruit extract depleted of silymarin with interesting properties for the treatment of acne, seborrhea, rosacea or seborrheic dermatitis.

Thus, to date, no reference has been made to silybum marianum lean fruit extract which is devoid of silymarin, which has hair-regrowing activity and can therefore be used for the prevention and/or treatment of alopecia.

Disclosure of Invention

The applicant has demonstrated, in an unexpected and unexpected way, that silymarin-depleted silybum marianum leptin extract has interesting pharmacological activities in the field of treatment and/or prevention against hair loss, in particular by promoting hair growth.

In fact, the inventors have demonstrated that silymarin-depleted silybum marianum leptin extract induces an increased expression of protein keratin 75 in hair follicles. Thus, silybum marianum lean extract, which is devoid of silymarin, helps to delay and prevent hair loss and thus to prolong the life cycle of the hair.

According to a first aspect, the present invention relates to a silybum marianum lean fruit extract comprising less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, for use in promoting hair growth, in particular for the treatment or prevention of alopecia such as androgenetic alopecia, reactive alopecia, post-menopausal alopecia, or alopecia areata or even cicatricial alopecia, in particular folliculitis, preferably exfoliative folliculitis.

The invention also relates to the use, in particular cosmetic or dermatological use, of an extract of silybum marianum lean fruit comprising less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, for promoting hair growth, in particular for treating or preventing alopecia such as androgenetic alopecia, reactive alopecia, post-menopausal alopecia, or alopecia areata, or even cicatricial alopecia, in particular folliculitis, preferably exfoliative folliculitis.

The invention also relates to the use of an extract of silybum marianum lean fruit comprising less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, for the preparation of cosmetic or dermatological compositions intended to promote hair growth, in particular to treat or prevent alopecia, such as androgenetic alopecia, reactive alopecia, post-menopausal alopecia, or alopecia areata, or even cicatricial alopecia, in particular folliculitis, preferably exfoliative folliculitis.

The invention also relates to a method, in particular a cosmetic or dermatological method, for promoting hair growth, in particular for treating or preventing alopecia, comprising administering to an individual in need thereof an effective amount of an extract of silybum marianum lean fruit containing less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, such as androgenic alopecia, reactive alopecia, post-menopausal alopecia, or alopecia areata, in particular folliculitis, preferably exfoliative folliculitis.

According to a second aspect, the invention relates to a dermatological or cosmetic composition containing at least one silybum marianum lean fruit extract comprising silymarin in an amount of less than 0.2%, preferably less than 0.1%, by weight relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, for promoting hair growth, in particular for the treatment or prevention of alopecia, such as androgenic alopecia, reactive alopecia, post-menopausal alopecia, or alopecia areata, or even cicatricial alopecia, in particular folliculitis, preferably exfoliative folliculitis.

The invention also relates to the use of a dermatological or cosmetic composition containing at least one extract of silybum marianum lean fruit comprising silymarin in an amount of less than 0.2%, preferably less than 0.1%, by weight relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, for promoting hair growth, in particular for the treatment or prevention of alopecia, such as androgenic alopecia, reactive alopecia, postmenopausal alopecia, or alopecia areata, or even cicatricial alopecia, in particular folliculitis, preferably exfoliative folliculitis.

The invention also relates to the use of a dermatological or cosmetic composition containing at least one silybum marianum lean fruit extract comprising silymarin in an amount of less than 0.2%, preferably less than 0.1%, by weight relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, for the preparation of a medicinal product intended to promote hair growth, in particular to treat or prevent alopecia, such as androgenic alopecia, reactive alopecia, post-menopausal alopecia, or alopecia areata, or even cicatricial alopecia, in particular folliculitis, preferably exfoliative folliculitis.

The invention also relates to a method, in particular a cosmetic or dermatological method, for promoting hair growth, in particular for treating or preventing alopecia, comprising administering to an individual in need thereof an effective amount of a dermatological or cosmetic composition containing at least one silybum marianum lean extract comprising less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, such as androgenic alopecia, reactive alopecia, postmenopausal alopecia, or alopecia areata, or even cicatricial alopecia, in particular folliculitis, preferably exfoliative folliculitis.

According to a third aspect, the invention relates to a method of dermatological treatment of an area of the scalp without hair, comprising the topical application, before or simultaneously with a hair transplant or scalp treatment (for example, a treatment with platelet rich plasma or capillary mesoderm therapy), of a silybum marianum extract containing less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, or of a dermatological composition containing at least one silybum marianum extract containing less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, and at least one dermatologically acceptable excipient, to the area of the scalp without hair.

Detailed Description

Definition of

In the present description, the abbreviated form of the plant Silybum marianum (l.) gartn can be designated by the term Silybum marianum.

"silymarin" in the meaning of the present invention refers to a purified extract of silybum marianum leptin, mainly comprising (at least 95% by weight) a mixture of the following four flavonolignans: silibinin, isosilibinin, silychristin and silidianin (Kuki et al, chromagraphics 75:175-180, 2012). Thus, a silymarin content of less than 0.2% by weight means that the total amount of silymarin components is less than 0.2% by weight. Such contents can be determined in particular by HPLC (high performance liquid chromatography) or UPLC (ultra performance liquid chromatography): the location of these peaks is determined by calculating the total area of the peaks corresponding to all the components of silymarin, in particular by using a reference sample of silymarin (e.g. available from Sigma Aldrich).

"Silibinin" is also referred to in the art as Silibinin (silibinine) and in the meaning of the present invention means the four diastereoisomers Silibinin A, silibinin B, 2, 3-cis-Silibinin A and 2, 3-cis-Silibinin B.

Within the meaning of the present invention, "isosilybin" means the two diastereoisomers isosilybin a and isosilybin B.

Within the meaning of the present invention, "silychristin" refers to both diastereoisomers silychristin a and silychristin B.

In the present specification, "about" means that the relevant numerical value may be less than or greater than 10%, particularly 5%, particularly 2%, more particularly 1% of the specified numerical value.

For the purposes of the present invention, the term "dry extract" is understood to mean an extract which contains no or only insignificant traces of extraction solvent or carrier (support). Thus, this dry extract contains only substances derived from silybum marianum. It may also contain insignificant traces of extraction solvent.

In the meaning of the present invention, "organic solvent immiscible with the oil obtained from silybum marianum" means an organic solvent which cannot be mixed, or can only be partially mixed, with the oil obtained from silybum marianum, so that the mixture of organic solvent and oil obtained from silybum marianum results in a heterogeneous mixture in which at least two different phases can be observed.

In the meaning of the present invention, "fatty acid" means a carboxylic acid R1-CO ₂ H, the chain R1 of which is a linear or branched hydrocarbon chain, saturated or comprising C = C double bonds, the carboxylic acid comprising from 16 to 22 carbon atoms (including the carbon atoms of the carboxylic acid function).

In the meaning of the present invention, "free" fatty acids (including linoleic acid) refer to fatty acids that are not bound to other molecules (e.g., to glycerol or its derivatives to give glycerides, or to alcohols to give fatty acid esters).

In the meaning of the present invention, "tocopherol" means alpha-tocopherol, beta-tocopherol, gamma-tocopherol and delta-tocopherol.

Within the meaning of the invention, "C ₁ To C ₃ Alcohol "refers to an R2-OH alcohol wherein the R2 chain is a saturated straight or branched hydrocarbon chain containing from 1 to 3 carbon atoms. It may be methanol, ethanol, n-propanol or isopropanol, in particular methanol, ethanol or isopropanol. Preferably, it will be ethanol or isopropanol, in particular ethanol.

In the meaning of the present invention, "room temperature" means a temperature of from 15 to 40 ℃, preferably from 20 to 30 ℃, in particular about 25 ℃.

By "hair and body hair" is meant hair, body hair, eyebrows, eyelashes and/or integuments (pelage), preferably hair.

"Hair growth (capillary hair)" means the growth of hair and/or body hair as defined above, preferably hair.

"alopecia (alopecie)" means total or partial loss of hair and/or body hair, for example, associated with reduced hair growth and/or increased hair and/or body hair loss. The term includes, but is not limited to, androgenetic alopecia, postmenopausal alopecia, reactive alopecia, cicatricial alopecia, alopecia areata, and congenital alopecia. Preferably, it will be androgenic alopecia, postmenopausal alopecia, reactive alopecia or alopecia areata. The consequences of alopecia are temporary or permanent, and partial or complete absence of hair and/or body hair.

Baldness (pelade) refers to the massive shedding of hair in patches, most commonly on the scalp. The affected individuals have plaques without hair, which are mostly circular or elliptical. On the other hand, the scalp is not affected and does not have scars.

"scalp area without hair" refers to an area of the scalp that is either without hair, regardless of size, or does not have sufficient hair growth to cover the area in question. It may be alopecia areata, or partial or total alopecia.

"folliculitis" refers to the papulopustular inflammation of one or more hair follicles. Thus, it can occur anywhere there is hair. It may be of bacterial, fungal, viral or non-infectious origin. Folliculitis can be superficial, folliculitis (osteitis-folliculite) or deep. There are different forms of folliculitis, e.g., exfoliative folliculitis or alopecia folliculitis. Exfoliative folliculitis of the scalp is a chronic and rare suppurative skin disorder of the scalp. It takes the form of a number of painful hair follicles and inflammatory nodules, pustules and abscesses surrounding the follicles, which are interconnected by sinus tracts, ultimately resulting in cicatricial alopecia. Canncoch alopecia folliculitis (follicullite d. Quinquaud) is also a chronic and rare inflammatory cicatricial alopecia of the scalp occurring in middle-aged persons, characterized by bald patches that spread slowly and concentrate mainly on the top of the scalp and occipital area, and perifollicular erythema, pustules and hemorrhagic scabs associated therewith.

The term "treating" alopecia is understood to mean stopping, reducing and/or slowing hair loss. Thus, "treating" alopecia includes limiting hair and/or body hair loss and/or promoting hair and/or body hair growth, increasing hair follicle density and/or regulating the hair follicle cycle.

The term "preventing" alopecia is understood to mean reducing the risk of developing alopecia, or slowing the progression of alopecia, in a mammal, preferably a human, susceptible to alopecia.

The term "limit" is understood to mean slow, decrease and/or stop.

The term "promoting" is understood to mean increasing, promoting, amplifying and/or accelerating.

In the present invention, the term "cosmetically or dermatologically acceptable" is intended to mean that it is used for the preparation of a cosmetic or dermatological composition, which is generally safe, non-toxic and not biologically or otherwise undesirable, and which is acceptable for cosmetic or dermatological use, in particular for topical application on the hair and/or scalp.

By "topical application" is meant application to the skin, in particular the scalp, mucous membranes, hair and/or body hair, in particular the hair and/or scalp.

Extracts according to the invention

The extract according to the invention is a silybum marianum lean extract comprising less than 0.2%, preferably less than 0.1% by weight of silymarin relative to the weight of the dry extract.

According to a particular embodiment, the extract according to the invention contains at least 3% by weight, preferably at least 4% by weight, of free linoleic acid relative to the weight of the dry extract. In particular, the extract according to the invention contains between 3% and 25% by weight, such as between 3 and 15% by weight, in particular between 4% and 10% by weight, in particular between 4% and 6% by weight, such as about 5% by weight, of free linoleic acid relative to the weight of the dry extract. The extract according to the invention may have a silymarin/free linoleic acid mass ratio of less than 0.07, in particular less than 0.05 and in particular less than 0.01, respectively.

The extract according to the invention may also comprise between 10% and 70%, in particular between 10% and 50%, more particularly between 10% and 30%, in particular between 15% and 25% of free fatty acids by weight relative to the weight of the dry extract.

According to a particular embodiment, the extract according to the invention contains at least 0.01% by weight, in particular 0.05% by weight, of tocopherol relative to the weight of the dry extract. In particular, the extract according to the invention contains between 0.01% and 2% by weight, more particularly between 0.01% and 1% by weight, even more particularly between 0.01% and 0.5% by weight, particularly between 0.05% and 0.2% by weight, for example about 0.1% by weight, of tocopherol, relative to the weight of the dry extract. The silymarin/tocopherol mass ratio in the extract according to the invention may in particular be less than 1, in particular less than 0.1.

According to another particular embodiment, the extract according to the invention contains between 3% and 25% by weight, such as between 3 and 20% by weight, in particular between 3% and 15% by weight, in particular between 4% and 10% by weight, in particular between 4% and 6% by weight, such as about 5% by weight, of free linoleic acid, relative to the weight of the dry extract; and between 0.01% and 2% by weight, in particular between 0.01% and 1% by weight, even more in particular between 0.01% and 0.5% by weight, in particular between 0.05% and 0.2% by weight, for example about 0.1% by weight, of tocopherol, relative to the weight of the dry extract. In particular, the extract according to the invention may have a silymarin/free linoleic acid mass ratio of less than 0.07, in particular less than 0.01, and the extract according to the invention may have a silymarin/tocopherol mass ratio of less than 1, in particular less than 0.1.

Preferably, the extract according to the invention will be a dry extract.

According to a preferred embodiment, the extract according to the invention is obtainable by the process according to the invention described hereinafter.

Method for preparing the extract according to the invention

The process for preparing the extract according to the invention comprises in particular the step of extracting the oil obtained from the thinned fruits of silybum marianum by means of an extraction solvent comprising (in particular consisting of): an aqueous hydrophilic solution, subcritical water or an organic solvent immiscible with the oil obtained from silybum marianum leptin, optionally mixed with water.

According to a particular embodiment, the extraction solvent comprises (in particular consists of) an organic solvent immiscible with the oil obtained from silybum marianum, optionally mixed with water.

The organic solvent which is immiscible with the oil obtained from the Elaeagnus silifolia may be in particular C ₁ To C ₃ An alcohol.

The extraction solvent may in particular be C optionally mixed with water ₁ To C ₃ An alcohol.

Organic solvent immiscible with oil obtained from Silybum marianum, in particular C ₁ To C ₃ Alcohols, such as methanol, ethanol or isopropanol, in particular ethanol or isopropanol, preferably ethanol, which can be used as a mixture in admixture with water, in particular in a volume ratio organic solvent/water of from 70/30 to 100/0, in particular from 80/20 to 100/0, for example about 80/20 or 90/10.

The extraction solvent can be chosen in particular from methanol, methanol/water mixtures, ethanol/water mixtures, isopropanol and isopropanol/water mixtures, in particular ethanol/water mixtures or isopropanol/water mixtures, preferably ethanol/water mixtures.

According to a particular embodiment, the extraction solvent will be methanol, an ethanol/water mixture in a volume ratio of about 80/20 or 90/10, or an isopropanol/water mixture in a volume ratio of about 90/10.

In particular, the extraction step of the oil from silybum marianum is carried out by mixing the oil obtained from silybum marianum with the extraction solvent for 1 to 12 hours, and in particular at a temperature of 15 to 25 ℃, in particular around 20 ℃. The amount of extraction solvent used to carry out this extraction will advantageously be between 0.5 and 3g, in particular between 1 and 3g, per 1g of oil obtained from silybum marianum.

An extraction phase and a lipid phase are then obtained at the end of this extraction. The extracted phase is advantageously separated from the lipid phase, partially or totally recovered, and then dried, in particular by evaporation of the extraction solvent, in particular under vacuum, in order to remove more or less the extraction solvent and obtain a dry extract (if the solvent is completely removed) or a concentrated extract diluted in residual solvent.

The oil obtained from silybum marianum leptin may advantageously be obtained by extraction of silybum marianum leptin (leptin may be whole or fragmented), in particular by pressing, advantageously by cold pressing at room temperature (i.e. without heating).

According to one embodiment of the invention, the process according to the invention will comprise the following two successive steps:

(i) Extracting oil from silybum marianum, and

(ii) The oil obtained from silybum marianum leptin is extracted with an extraction solvent comprising (in particular consisting of) an aqueous hydrophilic solution, subcritical water or an organic solvent immiscible with the oil obtained from silybum marianum leptin, optionally mixed with water.

According to a preferred embodiment of the invention, the process according to the invention will comprise the following successive steps:

(i) Optionally extracting oil from the silybum marianum leptin,

(ii) Extracting the oil obtained from silybum marianum with an extraction solvent comprising (in particular consisting of) an aqueous hydrophilic solution, subcritical water or an organic solvent immiscible with the oil obtained from silybum marianum optionally mixed with water,

(iii) (iii) recovering the extract phase obtained in step (ii), and

(iv) The extract phase is partially or totally dried to obtain a concentrated or dry extract according to the invention.

Step (i) will advantageously be carried out by cold pressing of the silybum marianum lean fruits (whole or fragmented).

Step (ii) will advantageously be carried out using an extraction solvent as defined above and is in particular selected from methanol, methanol/water mixtures, ethanol/water mixtures, isopropanol and isopropanol/water mixtures.

The extraction solvent may be in particular an organic solvent immiscible with the oil obtained from silybum marianum, in particular C ₁ To C ₃ Alcohols, such as methanol, ethanol or isopropanol, optionally in admixture with water, in particular in a volume ratio of organic solvent/water of between 80/20 and 100/0, in particular between 85/15 and 95/5, in particular about 90/10. An advantageous extraction solvent is an isopropanol/water mixture in a volume ratio of about 90/10.

The extraction step (ii) can be carried out by mixing the oil obtained from silybum marianum with the extraction solvent for 1 to 12 hours, and in particular at a temperature of between 15 and 25 ℃, in particular around 20 ℃. The amount of extraction solvent used to carry out this extraction will advantageously be from 0.5 to 3g, in particular from 1 to 3g, per 1g of oil obtained from silybum marianum.

This extraction step (ii) enables to obtain at the end the extracted phase of interest and the lipid phase.

Step (iii) is advantageously carried out by separating the extraction phase from the lipid phase.

Step (iv) is advantageously carried out under vacuum.

Cosmetic and dermatological applications

According to a first aspect, the present invention relates to a silybum marianum leptin extract comprising less than 0.2%, preferably less than 0.1% by weight of silymarin relative to the weight of dry extract, its use for promoting hair growth.

The invention also relates to a silybum marianum lean fruit extract comprising silymarin in an amount of less than 0.2%, preferably less than 0.1%, by weight relative to the weight of the dry extract, according to the invention, for use in the treatment or prevention of alopecia, such as androgenetic alopecia, reactive alopecia, post-menopausal alopecia or alopecia areata, or even for the treatment of exfoliative folliculitis.

The silybum marianum leptin extract according to the invention, comprising silymarin in an amount of less than 0.2%, preferably less than 0.1% by weight relative to the weight of the dry extract, may be used in combination with hair transplantation, in particular during micro-transplantation of follicular units. Follicular units refer to a group of hairs in the scalp that naturally clump together in small bundles, which may contain from one to four hairs. The use of a silybum marianum leptin extract comprising less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract according to the present invention is entirely suitable in particular in combination with laser hair transplantation.

The silybum marianum fruit extract according to the invention, comprising silymarin in an amount of less than 0.2% by weight, preferably less than 0.1% by weight, relative to the weight of the dry extract, can also be used in combination with treatments based on Platelet Rich Plasma (PRP). This is a platelet concentrate (and thus rich in growth factors) that can be injected into the scalp.

The silybum marianum lean fruit extract according to the invention, comprising less than 0.2%, preferably less than 0.1% by weight of silymarin relative to the weight of the dry extract, can also be used in combination with capillary mesoderm therapy. This is a technique commonly used in the medical and aesthetic fields, which involves injecting various multivitamins into the dermal layer of the scalp to deeply nourish hair follicles, so that the blood circulation of the scalp can be improved while treating the hair. Generally, two months of treatment is sufficient to normalize hair loss and sometimes increase hair density.

Therefore, the silybum marianum leptin extract according to the present invention, comprising silymarin in an amount less than 0.2%, preferably less than 0.1% by weight with respect to the weight of the dry extract, may be used before or simultaneously with hair transplantation or scalp treatment (e.g. treatment with platelet rich plasma or capillary mesoderm therapy).

According to a second aspect, the present invention relates to a dermatological or cosmetic composition containing at least one silybum marianum lean fruit extract according to the invention comprising less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of dry extract, and at least one dermatologically or cosmetically acceptable excipient, for its use in promoting hair growth.

The invention also relates to a dermatological or cosmetic composition containing at least one silybum marianum lean fruit extract according to the invention comprising less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, for the treatment or prevention of alopecia such as androgenetic alopecia, reactive alopecia, post-menopausal alopecia or alopecia areata, or even for the treatment of exfoliative folliculitis.

A dermatological or cosmetic composition containing at least one silybum marianum leptin extract according to the invention, comprising less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, can be used in combination with hair transplantation, in particular laser hair transplantation.

A dermatological or cosmetic composition containing at least one silybum marianum leptin extract according to the invention, comprising less than 0.2%, preferably less than 0.1% by weight of silymarin relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, can be used in combination with a treatment based on Platelet Rich Plasma (PRP).

A dermatological or cosmetic composition containing at least one silybum marianum lean extract according to the invention, comprising less than 0.2%, preferably less than 0.1% by weight of silymarin relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, can also be used in combination with a capillary mesoderm therapy.

Thus, a dermatological or cosmetic composition containing at least one silybum marianum leptin extract according to the invention, comprising less than 0.2%, preferably less than 0.1%, by weight of silymarin relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, can be used before or simultaneously with hair transplantation or scalp treatment (for example, treatment with platelet-rich plasma, or capillary mesoderm therapy).

Advantageously, the extract comprised in the dermatological or cosmetic composition is as described above.

According to a third aspect, the invention relates to a method for the dermatological treatment of scalp areas without hair, comprising the topical application, before or simultaneously with hair transplantation or scalp treatment (for example treatment with platelet-rich plasma or capillary mesoderm therapy), of a silybum marianum leptin extract according to the invention, comprising less than 0.2% by weight, preferably less than 0.1% by weight of silymarin relative to the weight of the dry extract, or of a dermatological composition according to the invention containing at least one silybum marianum leptin extract comprising less than 0.2% by weight, preferably less than 0.1% by weight of silymarin relative to the weight of the dry extract, and at least one dermatologically acceptable excipient, to scalp areas without hair.

Preferably, such dermatological treatment according to the invention precedes hair transplantation, in particular laser transplantation.

According to a particular embodiment of the invention, the method of dermatological treatment according to the invention is carried out for 1 to 6 weeks, preferably 1 to 4 weeks, even more preferably 2 to 4 weeks, before hair transplantation or scalp treatment (e.g. platelet-rich plasma treatment or capillary mesoderm therapy).

Preferably, the present invention is directed to the extract and the cosmetic or dermatological composition according to the invention, provided in their own form and in a form suitable for topical application, in particular to the scalp and/or hair.

The cosmetic or dermatological composition according to the invention may therefore be in the form generally known for topical application, i.e. in particular a lotion, shampoo, pomade, foam, gel, dispersion, emulsion, spray, essence, film or cream containing excipients which are in particular permeable to improve the characteristics and accessibility of the active ingredients.

Advantageously, the compositions according to the invention may be in the form generally known for topical application to the hair and scalp, i.e. in particular shampoos, conditioners, creams, hair lotions, films or sprays, in particular without rinsing.

Thus, a distinction is made between flushable formulation products and formulation products that do not require flushing.

Preferably, the composition according to the invention has a light texture, further allowing optimal penetration and does not leave the hair and/or body hair or scalp oily.

These compositions generally comprise, in addition to the extract according to the invention, a physiologically acceptable medium, which is generally based on water or a solvent, such as an alcohol, ether or glycol. They may also contain surfactants, complexing agents, preservatives, stabilizers, emulsifiers, thickeners, gelling agents, humectants, emollients, trace elements, essential oils, fragrances, colorants, humectants and the like.

According to a particular embodiment, the composition according to the invention comprises isopropanol, polyethylene glycol (PEG) or a mixture of these as cosmetically or dermatologically acceptable excipients. Advantageously, therefore, the composition according to the invention will comprise (in particular consist of) the extract according to the invention, isopropanol and PEG. The isopropanol/PEG mass ratio will advantageously be between 1/2 and 2/1, in particular between 1/1.5 and 1.5/1, in particular around 1/1.

The PEG may in particular have a number average molecular weight of between 200 and 600g/mol, in particular between 200 and 500g/mol, in particular between 200 and 400g/mol, for example between 250 and 350g/mol, in particular about 300 g/mol. This may in particular be PEG 300.

In another particular embodiment of the invention, the composition according to the invention is characterized in that it is in a form suitable for oral administration.

The compositions according to the invention can then be in the form generally known for oral administration, i.e. in particular tablets, capsules, powders, granules and oral solutions or suspensions. When preparing solid compositions in the form of tablets, the principal active ingredient may be mixed with cosmetic or dermatological carriers such as gelatin, starch, lactose, magnesium stearate, talc, gum arabic, silica and the like. The tablets may be coated with sucrose or other suitable material, or may be processed to provide extended, or delayed, activity and sustained release of a predetermined amount of the active ingredient. The capsule preparation can be obtained by mixing the active ingredient with a diluent and pouring the resulting mixture into a soft or hard capsule.

Advantageously, the composition according to the invention comprises between 0.01 and 15% by weight, preferably between 0.1 and 10% by weight of the extract according to the invention, relative to the total volume of the composition.

Examples

Example 1: preparation of the extract

The method according to the invention results in an isopropanol 90 extract (extract I) with a low silymarin content.

-cold pressing silybum marianum leptin to obtain the oil obtained from silybum marianum leptin,

-extracting the oil obtained from silybum marianum with an isopropanol/water mixture (90/10 v/v) for 2 hours at 20 ℃, using 1 gram of isopropanol/water mixture per gram of oil,

recovering the isopropanol phase, and

-evaporating the solvent.

Methanol extract (extract M) and ethanol extract (extract E) were obtained in a similar manner by replacing the isopropanol/water mixture (90/10 v/v) with methanol and ethanol/water mixture (90/10 v/v), respectively. The oil obtained from silybum marianum (1 volume of oil) was extracted with 3 volumes of methanol and 3 volumes of an ethanol/water mixture (90/10 v/v), respectively, at 20 ℃ for 2 hours.

These different extracts were characterized by UPLC (ultra performance liquid chromatography) or GC-MC (gas chromatography coupled mass spectrometry) according to the operating protocol detailed below.

Protocol for evaluating the obtained extract

Operation scheme 1: assessment of silymarin content by UPLC

Preparation of samples and controls:

silymarin control: a solution of 5mg of silymarin in 10ml of methanol/water mixture (60) (v/v) was prepared.

-a sample: the dry extract to be analyzed (extract M, E or I) was heated at 35 ℃ with stirring until a homogeneous and clear solution was obtained. 200mg of the extract was weighed out accurately and dissolved in 10ml of a methanol/dichloromethane mixture to dissolve the extract completely and homogenize the solution. The mixture ranged from methanol/dichloromethane (1) ratio (v/v) to pure methanol.

Analysis conditions were as follows:

column: acquisty BEH Shield C18 mm. Times.2.1 mm-1.7 μm (Waters)

Mobile phase:

-A: water +0.1% formic acid

-B: acetonitrile +0.1% formic acid

Gradient according to table 1 below:

[ Table 1]

T(min)	A(％)	B(％)
			0	90	10
15	60	40
			20	0	100
39.5	0	100
			40	90	10
45	90	10

Column temperature: 40 deg.C

Flow rate: 0.4ml/min

And (3) detection: 287nM

Sample injection volume: 1 μ L.

Operation scheme 2: assessment of linoleic acid content by UPLC

Preparation of samples and controls:

linoleic acid control: a solution of 10mg of linoleic acid in a 10ml mixture of methanol/dichloromethane (1) (v/v) was prepared.

-a sample: the dry extract to be analyzed (extract M, E or I) was heated at 35 ℃ with stirring until a homogeneous and clear solution was obtained. 50mg of the extract was weighed out accurately and dissolved in 1ml of a methanol/dichloromethane mixture to dissolve the extract completely and homogenize the solution. The mixture ranged from methanol/dichloromethane (1) ratio (v/v) to pure methanol.

Analysis conditions were as follows:

column: acquity BEH Shield C18 mm X2.1 mm-1.7 μm (Waters)

Mobile phase:

-A: water +0.1% formic acid

-B: acetonitrile +0.1% formic acid

The gradient was according to table 2 below:

[ Table 2]

T(min)	A(％)	B(％)
			0	50	50
1	50	50
			10	0	100
15	0	100
			15.5	50	50
20	50	50

Column temperature: 40 deg.C

Flow rate: 0.4ml/min

And (3) detection: 215nM

Sample introduction volume: 1 μ L.

Operation scheme 3: fatty acid content assessment by GC-MS

Preparing a sample:

the dry extract to be analyzed was heated to 35 ℃ with stirring until a clear and homogeneous liquid was obtained.

20mg of the extract was dissolved in 800. Mu.l of a methanol/dichloromethane (1) (v/v) mixture.

200 μ l of the derivative N, O-bis (trimethylsilyl) trifluoroacetamide (BSTFA) + Trimethylchlorosilane (TMCS) (99).

Vortex for 1 minute.

Gas Chromatography (CPG) conditions:

column: DB-5ms (Agilent Technologies); 30m × 0.25mm;0.25 μm

Sample introduction: t =300 ℃; mode = shunting; split ratio =100

Furnace: temperature gradient (. Degree. C.)

-initial temperature =150 ℃

Gradient = ramp up to final temperature =340 ℃ at 7 ℃/min

-holding at 340 ℃ for 10 minutes

Carrier gas flow rate: 1ml/min

And (3) detection: MS-EI, T =300 ℃, scan time =0.2 seconds; full Scan Start Mass) =40; full Scan End Mass (Full Scan End Mass) =600.

Sample introduction volume: 1 μ L.

Results

The silybum marianum lean fruit extract I according to the invention mainly contains substances with a retention time by UPLC between 13 and 30 minutes.

Extract I was assayed for silymarin content by UPLC after calibration with a control solution of commercial silymarin (Sigma Aldrich).

The extract I contained 0.06% by mass of silymarin.

The content of free fatty acids, and more particularly of linoleic acid, in extract I, as determined by UPLC and CPG, is given in Table 3 below

[ Table 3]

The inventors were able to demonstrate that the UPLC and CPG profiles of the 3 leptin extracts obtained by methanol extraction (extract M), ethanol 90 extraction (extract E) and isopropanol 90 extraction (extract I) were similar.

The following characteristics can be demonstrated by various analyses performed by UPLC and GC-MS:

the isopropanol 90 extract of leptin fruit (extract I) according to the invention is practically free of silymarin, in particular of polar flavonolignans.

UPLC and CPG profiles of the extracts of 3 leptin fruits according to the invention obtained by methanol extraction, ethanol 90 extraction and isopropanol 90 extraction are very similar.

Example 2: quantification of protein keratin 75 in the frontal follicles of human subjects

The aim of this example is to evaluate the effect of a silybum marianum leptin extract containing less than 0.2% by weight of silymarin on human keratin 75 protein expression. In fact, this pharmacological activity is of interest in the field of treatment and/or prevention of hair loss, in particular by promoting hair growth.

Method

The topical formulation of extract I prepared in example 1 was formulated with 1.75% or 7.0% (w/v) of dry extract in an isopropanol/PEG 300 (1).

13 healthy volunteers were followed for 4 to 12 weeks depending on their availability. The study was performed according to the declaration of Helsinki (D claring D' hellinnki) and written consent was obtained from each subject. This is a longitudinal observational single-center study. Throughout the study, subjects received close supervision of the same staff at a private clinic, supplemented with permanent digital contact and communication with the subjects. Weekly monitoring of installed digital-based devices. Hair follicle samples were taken at each visit.

Cyanoacrylate hair follicle samples were taken from the forehead of the subject using a drop of 2-ethyl cyanoacrylate adhered to a glass microscope slide, according to Pi rerard et al (Scientific World Journal,2014ID 463634, 2014).

Protein extraction:

the biopsy tissue was separated from the glass slide, cut into small pieces in distilled water at room temperature for 30 minutes, and then homogenized in 2mM Tris-HCl extraction buffer, pH 6.8,3% SDS, 10mM sodium pyrophosphate, 5mM EDTA, and 2mM sodium vanadate. The samples were heated at 50 ℃ for 3 hours. The extract was centrifuged at 10,000rpm for 10 minutes. The proteins in the supernatant were determined according to Bradford's method (Anal Biochem 72, 248-254, 1976) using Bio-Rad reagent (Cresier, switzerland). The sebaceous gland cell cultures were washed with PBS buffer and then in a specific buffer (Tris-HCl 50mM pH 7.4, naCl 150mM, EDTA1mM, triton) ^TM X-100%) in the cells. The suspension was passed through a sonicator and then analyzed by the Bradford method.

Protein samples were analyzed by Western blotting (Western Blot) using standard procedures and the following antibodies: polyclonal rabbit anti-human IgG K75, dilution 1:5000 (Fisher Scientific, reinach, switzerland).

Proteomic analysis was performed by electrophoresis (SDS-PAGE) followed by coomassie staining. The stained protein bands were harvested and analyzed on the proteomics platform of geneva university.

Results

The expression levels of K75 protein (density units of western blot bands) in the forehead hair follicles of human subjects before and after treatment with the extract according to the present invention are shown in table 4 below.

[ Table 4]

The inventors clearly show that treatment with the extract according to the invention induces a statistically significant increase in K75 protein expression (P < 0.001). Notably, this increase was observed in all patients regardless of the concentration tested or the duration of treatment administered. In fact, the expression of K75 protein appeared to have increased very significantly already after 4 weeks of treatment.

Example 3: quantification of the level of protein keratin 75 in the scalp of bald spot patients

In this severe hair disease, very low expression of K75 was observed. Patients were treated with the same extract at a concentration of 7% and using the same manner as in example 2. The results obtained, i.e. the expression levels of K75 protein (density units of western blot bands) in hair follicles of bald patients before and after treatment with the extract according to the present invention are shown in table 5 below.

[ Table 5]

The inventors thus demonstrated that a treatment comprising an extract according to the invention is able to significantly increase the expression level of K75 in bald plaque patients. Notably, hair regrowth can be observed at the end of the treatment.

All these results make it possible for the inventors to emphasize the benefit of silybum marianum leptin extract containing less than 0.2% by weight of silymarin on hair regrowth promotion.

Example 4: quantification of keratin 75 levels in bald scalp and scalp with hair regrowth

In this severe hair disease, the expression of K75 was found to be very low. Two patients with bald plaques (for two or three bald plaques) were treated with the same 7% concentration of the extract and in the same manner as in example 2 for four weeks. The results for K75 protein density and hair density (total of 5 bald spots) are given in table 6 below.

[ Table 6]

Thus, the inventors clearly demonstrated that a treatment comprising the extract according to the invention was able to significantly increase the expression level of K75 in two bald plaque patients. This increase is associated with hair regrowth. In fact, the hair density is increased more than doubled after application of the extract according to the invention.

Thus, the topical application of the extract according to the invention to the scalp allows to create conditions that are favourable for hair regrowth. Therefore, the present inventors clearly demonstrated that such an extract can be applied for the prevention of hair transplantation or medical treatment, such as PRP or mesoderm therapy, etc.

Example 5: specific effects of silybum marianum leptin extract on EGFR and PDGFR beta receptor phosphorylation in papillary hair cells By using

The aim of this study was to demonstrate that 30 μ g/mL of the tested extract of silybum marianum leptin specifically induces the phosphorylation of tyrosine of receptors with tyrosine kinase activity (phospho-RTKs) and the phosphorylation of kinases of various signaling pathways (phospho-kinases), in contrast to the tested 0.06 μ g/mL of silymarin (Sigma). The control was treated with dimethyl sulfoxide (DMSO) which was used as a solvent for the silybum marianum extract and silymarin.

The study was performed on hair papilla cells, which were isolated from human hair follicles and cultured in a petri dish for 48 hours. Then, dermal papilla cells are stimulated in the presence of silybum marianum extract or silymarin for 1 hour. Then, total cell lysates were prepared and tested for phosphorylation of various biological targets. Images of these targets were obtained with the aid of two antibody array kits using a cellulose membrane with antibodies printed thereon to detect the presence of the protein of interest (protein profile human array kit, R & D Systems). A list of pharmacological targets screened in these tests, available on-line, is as follows:

49 phosphorylated receptors having tyrosine kinase activity

(https://www.rndsystems.com/products/proteome–profiler–human–phospho–rtk–array–kit_ary001b)

43 signalling phosphokinases

(https://www.rndsystems.com/products/proteome–profiler–human phospho-kinase–array–kit_ary003b#product–datasheets).

The chemiluminescent signal was then detected using a densitometer (ChemiDoc, biorad) and quantified by Image J1.52 software using a microarray map insert. Data analysis enables determination of the average intensity of the pixels under each experimental condition and measurement of the ratio relative to the DMSO control. Finally, two independent donors of dermal papilla cells were tested and run in duplicate.

The photo-acceptor results are shown in table 7 below.

[ Table 7]

Group of	Phosphorylated EGFR	Phosphorylated PDGFR-beta
			Ratio: silybum marianum extract/control	1.91	2.77
Ratio: silymarin/control	1.02	0.76

These results show that silybum marianum extract significantly increases tyrosine phosphorylation of both receptors in response to treatment for one hour, at a ratio of 1.91 and 2.77, respectively. On the other hand, the ratio after incubation with silymarin was still close to 1, with ratios of 1.02 and 0.76 for EGFR and PDGFR β, respectively. These data indicate that 30 μ g/ml of silybum marianum leptin extract has a specific effect on the targets EGFR and PDGFR β and that phosphorylation of both receptors is not regulated by silymarin at a concentration of 0.06 μ g/ml.

Furthermore, the results of the screening for signal transduction phosphorylation kinases are given in table 8 below, which shows that silybum marianum leptin extract induces the phosphorylation of tyrosine of signal transduction kinases, which is the ratio of silybum marianum extract/control.

[ Table 8]

PDGFRβ	ERK 1/2	GSK 3a/b	Akt 1/2/3	STAT5a	STAT5a/b	b-catenin
							1.94	1.23	1.51	2.00	1.74	1.60	1.72

These experimental results can confirm that PDGFR β is actually tyrosinated at residue Y751 in response to silybum marianum extract (ratio 1.94). In addition, the extract activates the known EGFR and PDGFR β signaling pathways, namely: ERK 1/2 (T202/Y204, T185/Y187); GSK3 a/b (S21/S9); akt 1/2/3 (S473); STAT 5a (Y694); STAT 5a/b (Y694/Y699) and total b-catenin.

In summary, a series of results from this example show that silybum marianum extract specifically activates (independent of the presence of silymarin) the phosphorylation of EGFR and PDGFR β tyrosine, as well as its signaling pathway in papillary hair cells.

Claims

1. Use of a Silybum marianum (l.) leptin extract comprising less than 0.2% by weight of silymarin relative to the weight of dry extract, in the preparation of a dermatological or cosmetic composition for promoting hair growth, wherein said Silybum marianum leptin extractObtained by extracting the oil obtained from the leptin of Silybum marianum with an extraction solvent selected from C ₁ To C ₃ C optionally mixed with water, with a volume ratio of alcohol/water between 80/20 and 100/0 ₁ To C ₃ An alcohol.

2. Use according to claim 1, characterized in that said extract is a silybum marianum lean extract containing less than 0.1% by weight of silymarin relative to the weight of the dry extract.

3. Use according to claim 1, characterized in that said extract is in a form suitable for topical application.

4. Use according to claim 1, characterized in that the extract is used for preventing or treating alopecia.

5. Use according to claim 4, characterized in that the alopecia is selected from androgenetic alopecia, reactive alopecia, post-menopausal alopecia, alopecia areata and cicatricial alopecia.

6. Use according to claim 5, characterized in that the cicatricial alopecia is folliculitis.

7. Use according to claim 6, characterized in that said folliculitis is exfoliative folliculitis.

8. Use according to claim 1, characterized in that the extraction solvent is an isopropanol/water mixture.

9. Use according to claim 1, characterized in that the extraction solvent is an isopropanol/water mixture in a volume ratio of 90/10.

10. Use according to any one of claims 1 to 9, characterized in that the extract is used before or simultaneously with hair transplantation or scalp treatment.

11. Use according to claim 10, characterized in that the scalp treatment is a treatment with platelet-rich plasma or a capillary mesoderm therapy.

12. Use according to claim 1, characterized in that the dermatological or cosmetic composition contains at least one Silybum marianum leptin extract comprising less than 0.2% by weight of silymarin relative to the weight of dry extract, obtained by extraction of the oil obtained from the silybum marianum leptin, by an extraction solvent selected from C, and at least one dermatologically or cosmetically acceptable excipient ₁ To C ₃ C optionally mixed with water, with a volume ratio of alcohol/water between 80/20 and 100/0 ₁ To C ₃ An alcohol.

13. Use according to claim 12, characterized in that said composition is in a form suitable for topical application.

14. Use according to claim 12, characterized in that the extraction solvent is an isopropanol/water mixture.

15. Use according to claim 12, characterized in that the extraction solvent is an isopropanol/water mixture in a volume ratio of 90/10.

16. Use according to any one of claims 12 to 15, characterized in that the composition contains from 0.01% to 15% by weight, relative to the total weight of the composition, of a silybum marianum lean extract comprising less than 0.2% by weight of silymarin, relative to the weight of dry extract.

17. Silybum marianum containing silymarin less than 0.2% by weight relative to the weight of the dry extractCosmetic use of an extract of silybum marianum for promoting hair growth, wherein said extract of silybum marianum is obtained by extracting an oil obtained from the silybum marianum by an extraction solvent selected from C ₁ To C ₃ C optionally mixed with water, with a volume ratio of alcohol/water between 80/20 and 100/0 ₁ To C ₃ An alcohol.

18. Cosmetic use according to claim 17, characterized in that said extract is a silybum marianum lean extract containing less than 0.1% by weight of silymarin relative to the weight of dry extract.

19. Cosmetic use according to claim 17 or 18, characterized in that said extract is in a form suitable for topical application.

20. Use according to claim 17, characterized in that the extraction solvent is an isopropanol/water mixture.

21. Use according to claim 17, characterized in that the extraction solvent is an isopropanol/water mixture in a volume ratio of 90/10.

22. Cosmetic use of a dermatological or cosmetic composition containing at least one silybum marianum leptin extract comprising silymarin in an amount less than 0.2% by weight relative to the weight of the dry extract, and at least one dermatologically or cosmetically acceptable excipient, for promoting hair growth, wherein said silybum marianum leptin extract is obtained by extracting the oil obtained from silybum marianum leptin, with an extraction solvent selected from C ₁ To C ₃ C optionally mixed with water, in a ratio by volume of alcohol/water of between 80/20 and 100/0 ₁ To C ₃ An alcohol.

23. Cosmetic use according to claim 22, characterized in that said extract is a silybum marianum extract containing less than 0.1% by weight of silymarin relative to the weight of dry extract.

24. Cosmetic use according to claim 22, characterized in that said composition is in a form suitable for topical application.

25. Use according to claim 22, characterized in that the extraction solvent is an isopropanol/water mixture.

26. Use according to claim 22, characterized in that the extraction solvent is an isopropanol/water mixture in a volume ratio of 90/10.

27. Cosmetic use according to any one of claims 22 to 26, characterized in that the composition contains from 0.01% to 15% by weight of silybum marianum extract relative to the total weight of the composition.